aDirectory stores a variety of objects within the directory DB. The directory DB stores users, groups, computers, and printers.
All objects in aDirectory are defined by the schema. The
'aDirectory schema' consists of
'object classes' and
'attributes'.
The logical parts of aDirectory include domains, organizational units,
forests,
trees, and trusts. The physical parts of aDirectory include domain controllers,
sites, and site links.
When users need to access aDirectory then the Lightweight Directory Access Protocol (LDAP) is used to query or update the aDirectory DB.